JP7510393B2 - Deck slab lifting jig and deck slab lifting method - Google Patents

Description

This disclosure relates to a deck slab lifting jig and deck slab lifting method.

Various deck hoisting devices and methods for hoisting decks have been known in the past. JP 2001-81731 A describes a deck dismantling device that dismantles concrete decks that have become aging and require replacement. This deck dismantling device comprises a pair of bases that are placed on the upper surface of the deck, a beam member that spans the pair of bases and extends horizontally above the deck, and a pair of threaded steel rods that penetrate the beam member vertically.

The deck to be removed is cut in advance, and a base is placed on the top surface of the deck on both the left and right sides of the deck to be removed. The beam member is located above the deck to be removed, and each of the pair of threaded steel rods passes vertically through a through hole formed in the deck to be removed. An anchor plate and nut are placed below each through hole in the deck to be removed, and the lower end of each threaded steel rod is fixed to the deck to be removed by passing vertically through the anchor plate and screwing into the nut.

An anchor plate and a nut are placed on the top surface of the beam member, and the upper end of each threaded steel rod is fixed to the beam member by screwing it into the nut while passing vertically through the anchor plate. The upper end of each threaded steel rod protrudes upward from the nut, and an electric wrench is attached to the upwardly protruding part of each threaded steel rod. This electric wrench rotates the nut fixed to the beam member, causing the threaded steel rods to rise, and as each threaded steel rod rises, the deck slab to be removed rises and is dismantled. The dismantled deck slab is removed from the site.

JP 2001-81731 A

In the deck dismantling device described above, a through hole is formed vertically through the deck to be removed, and a threaded steel rod is inserted into the through hole. An anchor plate and a nut into which the threaded steel rod is screwed are then placed below the through hole in the deck to be removed. The task of placing the anchor plate and nut below the through hole must be performed manually. This makes the installation of the device on the deck to be removed complicated, and there is room for improvement in the ease of work involved in lifting the deck.

The purpose of this disclosure is to provide a deck slab lifting jig and a deck slab lifting method that can easily perform the work involved in lifting a deck.

The deck lifting jig according to the present disclosure is a deck lifting jig for lifting a deck, and comprises: a core rod which is inserted into a hole formed in the deck and has a first expanded portion at its lower end which has an outer diameter smaller than the inner diameter of the hole; an expanding member having a tubular portion through which the core rod is inserted and a second expanded portion which can be expanded at the lower end of the tubular portion; and a hanging member which suspends the expanding member at a position facing the outer surface of the core rod, wherein the expanding member is movable along the core rod, and when moved downward relative to the core rod, the tubular portion gets caught on the first expanded portion and the second expanded portion gets expanded in diameter, and the maximum outer diameter of the expanded second expanded portion is larger than the inner diameter of the hole, and the hanging member includes a wire supported on the outer surface of the core rod, and the hanging member has a ring-shaped portion located at the upper end of the wire, and the core rod has a hook portion fixed to the outer surface of the core rod, and the wire is supported on the outer surface by the ring-shaped portion getting caught on the hook portion .

In this deck slab lifting jig, the core rod inserted into the hole formed in the deck has a first enlarged diameter portion, and the first enlarged diameter portion is smaller than the inner diameter of the hole. The deck slab lifting jig has an enlarged diameter member inserted into the core rod, and the enlarged diameter member has a cylindrical portion through which the core rod is inserted and a second enlarged diameter portion that can be enlarged at the lower end of the cylindrical portion. The enlarged diameter member is suspended by a hanging member at a position facing the outer surface of the core rod and can move up and down along the core rod. When the enlarged diameter member moves downward relative to the core rod, the cylindrical portion is caught on the first enlarged diameter portion, and the second enlarged diameter portion is enlarged while moving downward along the first enlarged diameter portion. The maximum value of the outer diameter of the second enlarged diameter portion that moves downward and enlarges is larger than the inner diameter of the hole. Therefore, by enlarging the second enlarged diameter portion with the first enlarged diameter portion of the core rod inserted in the hole, the second enlarged diameter portion, which is larger than the inner diameter of the hole, can be hooked onto the hole. By pulling up the core rod in this state, the deck can be lifted with the second enlarged portion hooked into the hole, eliminating the need to place an anchor plate or nut under the hole. This makes it easy to perform the work involved in lifting the deck.

The expanding member may have a hinge portion that supports the second expanding portion so that it can swing relative to the cylindrical portion along the radial direction of the cylindrical portion. In this case, the second expanding portion is supported so that it can swing relative to the cylindrical portion via the hinge portion. Therefore, the second expanding portion can be smoothly expanded relative to the cylindrical portion.

The core rod may have a reduced diameter portion located at the lower end of the first enlarged diameter portion. In this case, since the reduced diameter portion is located at the lower end of the core rod, it is possible to easily insert the core rod into the hole in the deck located below the core rod. In other words, by inserting the core rod from above the hole with the reduced diameter portion facing downward, the possibility of the core rod getting caught in the hole can be reduced, and the core rod can be smoothly inserted into the hole.

A wire having a simple structure can be used as the hanging member for hanging the diameter expanding member. Furthermore, since the structure of the hanging member can be simplified, the handling properties of the hanging member can be improved.

The wire can be supported on the outer surface of the core rod by hooking the annular portion onto the hook portion, thus simplifying the structure of the hanging member.

The deck lifting method according to the present disclosure is a deck lifting method for lifting a deck, comprising the steps of: forming a hole in the deck; inserting a first expansion portion of a core rod of a deck lifting jig into the hole; inserting into the hole an expansion member having a tubular portion through which the core rod is inserted and a second expansion portion that is expandable relative to the tubular portion; expanding the second expansion portion to hook it onto the deck; and lifting the deck by pulling up the core rod with the second expansion portion hooked . The deck lifting jig has a hanging member that suspends the expansion member at a position facing the outer surface of the core rod, the hanging member including a wire supported on the outer surface of the core rod, the hanging member having a ring-shaped portion located at the upper end of the wire, the core rod having a hook portion fixed to the outer surface of the core rod, and the wire being supported on the outer surface by hooking the ring-shaped portion onto the hook portion .

In this deck hoisting method, a hole is formed in the deck and a first enlarged portion of a core rod is inserted into the formed hole. A cylindrical portion of an enlarged member is inserted into the core rod, and the enlarged member has a second enlarged portion that can be enlarged relative to the cylindrical portion. The enlarged member is inserted into the hole in the deck into which the first enlarged portion of the core rod is inserted, and the second enlarged portion of the enlarged member is enlarged relative to the hole in the deck to hook the second enlarged portion onto the deck. The deck is then lifted by pulling up the core rod with the second enlarged portion hooked onto the deck. Therefore, since the deck can be lifted by pulling up the core rod with the second enlarged portion hooked onto the deck, the task of placing an anchor plate or nut below the hole can be eliminated. This makes it easy to perform the tasks involved in lifting the deck.

This disclosure makes it easy to perform the work involved in lifting the deck.

FIG. 2 is a side view showing the deck slab lifting jig according to the embodiment. 2 is a cross-sectional view taken along line AA in FIG. 1. 2 is a cross-sectional view taken along line BB in FIG. 1. 2A, 2B, and 2C are cross-sectional views showing examples of a hinge portion of a diameter expanding member of the deck slab lifting jig of FIG. 1 . 2 is an enlarged cross-sectional view of a first enlarged diameter portion of a core rod of the deck lifting jig of FIG. 1 and a second enlarged diameter portion of an enlarged diameter member. FIG. 2A is a side view showing a hanging member for hanging the diameter expanding member of the deck slab lifting jig of FIG. 1 , and FIG. 2B is a cross-sectional view showing the hanging member and the core rod of FIG. FIG. 2 is a cross-sectional view showing the deck slab and the deck slab of FIG. 1 . FIG. 2 is a plan view showing the deck slab and the deck slab of FIG. 1 . FIG. 2 is a cross-sectional view showing one step of the deck hoisting method according to the embodiment. 10 is a cross-sectional view showing a process subsequent to that shown in FIG. 9. 11 is a cross-sectional view showing a process subsequent to that shown in FIG. 10 . 12 is a cross-sectional view showing a process subsequent to that shown in FIG. 11 . A cross-sectional view showing one step of a deck slab lifting method according to a modified example. 14 is a cross-sectional view showing a process subsequent to that shown in FIG. 13. 15 is a cross-sectional view showing a process subsequent to that shown in FIG. 14. FIG. 11 is a cross-sectional view showing a deck slab lifting jig according to a modified example. 13A and 13B are cross-sectional views showing modified examples of holes formed in a deck slab.

Below, an embodiment of the deck hoisting jig and deck hoisting method according to the present disclosure will be described with reference to the drawings. In the description of the drawings, the same or corresponding elements are given the same reference numerals, and duplicated descriptions will be omitted as appropriate. In addition, the drawings may be partially simplified or exaggerated to facilitate understanding, and the dimensional ratios, etc. are not limited to those shown in the drawings.

Figure 1 is a side view showing the deck hoisting jig 1 according to this embodiment. The deck hoisting jig 1 hoists the deck C (see Figure 7). Specifically, the deck hoisting jig 1 according to this embodiment is a jig used when hoisting the deck C, which is a concrete deck. The deck C is hoisted, for example, when updating the deck C, removing the deck C, or constructing a new deck C. The deck hoisting jig 1 includes a core rod 10 extending along the longitudinal direction D1, which is the thickness direction of the deck C, an expansion member 20 inserted into the core rod 10, and a hanging member 30 that hangs the expansion member 20 at a position facing the outer surface of the core rod 10.

The core rod 10 is inserted into a hole C3 (see FIG. 7) formed in the deck C. The core rod 10 is, for example, a steel rod. However, the material of the core rod 10 is not limited to metal, and may be FRP (Fiber Reinforced Plastics) or the like. The core rod 10 has a rod-shaped portion 11 extending along the longitudinal direction D1, and a first enlarged diameter portion 12 that enlarges in diameter at one end of the rod-shaped portion 11 in the longitudinal direction D1.

The rod-shaped portion 11 has, for example, a round rod shape (cylindrical shape). For example, a first enlarged diameter portion 12 having an outer diameter smaller than the inner diameter of the hole C3 is formed at the lower end of the core rod 10. The outer diameter of the core rod 10 will be described in detail later. The diameter of the first enlarged diameter portion 12 gradually increases from one end of the rod-shaped portion 11 in the longitudinal direction D1. In this case, the outer surface of the first enlarged diameter portion 12 is a tapered surface that increases in diameter as it moves away from the rod-shaped portion 11.

For example, the core rod 10 may have a reduced diameter portion 13 on the opposite side of the first enlarged diameter portion 12 from the rod-shaped portion 11. The reduced diameter portion 13 is located at one end of the core rod 10 in the longitudinal direction D1, and corresponds to the portion that reduces in diameter from the first enlarged diameter portion 12. The reduced diameter portion 13 is a portion that makes it easier to insert the core rod 10 into the hole C3 of the deck C, and the reduced diameter portion 13 of the core rod 10 that enters the hole C3 allows the core rod 10 to be inserted into the hole C3 more smoothly. The reduced diameter portion 13 is, for example, a tapered surface that gradually reduces in diameter as it moves away from the first enlarged diameter portion 12.

Figure 2 is a cross-sectional view of line A-A in Figure 1. As shown in Figures 1 and 2, the diameter expansion member 20 is inserted into the core rod 10 and is suspended by the hanging member 30. The diameter expansion member 20 has, for example, a tubular shape (cylindrical shape as one example). The diameter expansion member 20 has a second diameter expansion section 21 that can be expanded in the radial direction D2 of the diameter expansion member 20, and a tubular section 22 located at the top of the second diameter expansion section 21.

Figure 3 is a cross-sectional view of line B-B in Figure 1. As shown in Figures 2 and 3, for example, the expanding member 20 has a plurality of second expanding portions 21. Each of the plurality of second expanding portions 21 is movable in the radial direction D2 relative to the core rod 10. When viewed along the longitudinal direction D1, the plurality of second expanding portions 21 are connected to the cylindrical portion 22 in a separated state. The expanding member 20 is made of, for example, metal. However, the material of the expanding member 20 may be FRP and is not particularly limited.

The second expansion section 21 is expandable at the lower end of the cylindrical section 22. When viewed along the longitudinal direction D1, each of the multiple second expansion sections 21 divided from one another is movable in the radial direction D2 relative to the cylindrical section 22. The dotted lines in Figure 3 show a schematic diagram of the state in which the expansion member 20 moves downward relative to the core rod 10 and each second expansion section 21 moves downward along the first expansion section 12 and is expanded in diameter.

As an example, the expanding member 20 has four second expanding sections 21. In this case, the difference between the curvature of the first expanding section 12 and the curvature of the second expanding section 21 can be reduced, and the configuration of the expanding member 20 can be simplified. However, the number of second expanding sections 21 that the expanding member 20 has may be two, three, or five or more (for example, six or eight), and is not particularly limited.

The core rod 10 is inserted into the tubular portion 22. For example, the tubular portion 22 is inserted into the rod portion 11 of the core rod 10. That is, the tubular portion 22 is located outside the rod portion 11 in the radial direction D2. The tubular portion 22 is movable along the longitudinal direction D1 relative to the rod portion 11. When the tubular portion 22 is located above a certain position in the rod portion 11, the second enlarged portion 21 does not enlarge in diameter, and when the tubular portion 22 moves below the certain position, the second enlarged portion 21 enlarges in diameter following the outer surface of the first enlarged portion 12.

Figures 4(a), 4(b) and 4(c) are cross-sectional views that show schematic examples of the connection structure between the second enlarged diameter portion 21 and the cylindrical portion 22. As shown in Figures 4(a) to 4(c), the enlarged diameter member 20 has, for example, hinge portions 23A, 23B and 23C that support the second enlarged diameter portion 21 so that it can swing relative to the cylindrical portion 22 along the radial direction D2 of the cylindrical portion 22.

In the example shown in FIG. 4(a), the hinge portion 23A is attached to the outside of the second enlarged diameter portion 21 and the cylindrical portion 22 in the radial direction D2. In other words, the hinge portion 23A is located outside the radial direction D2 between the second enlarged diameter portion 21 and the cylindrical portion 22, and the second enlarged diameter portion 21 is free to rotate (swing) around the hinge portion 23A.

In the example shown in FIG. 4(b), the hinge portion 23B is disposed between the second enlarged diameter portion 21 and the cylindrical portion 22. The hinge portion 23B as an example has a first portion embedded in the second enlarged diameter portion 21, a second portion embedded in the cylindrical portion 22, and a connecting portion that rotatably connects the first portion and the second portion to each other. The second enlarged diameter portion 21 is rotatable around the hinge portion 23B. The hinge portion 23B is disposed so as not to protrude outward or inward in the radial direction D2 relative to the second enlarged diameter portion 21 and the cylindrical portion 22. This makes it possible to make the hinge portion 23B even less likely to get in the way.

In the example shown in FIG. 4(c), the hinge portion 23C is a flexible material disposed between the second enlarged diameter portion 21 and the cylindrical portion 22. The hinge portion 23C may be a portion that is thinner than the second enlarged diameter portion 21 and the cylindrical portion 22. When the hinge portion 23C disposed between the second enlarged diameter portion 21 and the cylindrical portion 22 is made of a thin flexible material, the second enlarged diameter portion 21 can be swung in the radial direction D2 via the hinge portion 23C. The hinge portions 23A, 23B, and 23C have been illustrated above, but the structure of the hinge portion that connects the second enlarged diameter portion 21 and the cylindrical portion 22 to each other is not limited to the above examples and can be modified as appropriate.

Figure 5 is an enlarged cross-sectional view of the second enlarged diameter portion 21 and the first enlarged diameter portion 12 of the core rod 10 in a state where they have moved downward and expanded in diameter. Figure 5 is a cross-sectional view of the first enlarged diameter portion 12 and the second enlarged diameter portion 21 cut by a plane extending along the longitudinal direction D1. As shown in Figure 5, the length of the expanded second enlarged diameter portion 21 in the longitudinal direction D1 is longer than the length of the first enlarged diameter portion 12 in the longitudinal direction D1. Therefore, when the tubular portion 22 is hooked on the upper end of the first enlarged diameter portion 12, the lower end of the second enlarged diameter portion 21 protrudes downward beyond the lower end of the first enlarged diameter portion 12 (reduced diameter portion 13).

The maximum diameter L3 of the first enlarged diameter portion 12 is larger than the diameter L1 of the rod-shaped portion 11, and as an example, the maximum diameter L3 is 10 mm larger than the diameter L1. For example, the diameter L1 is 36 mm, and the maximum diameter L3 is 46 mm. The maximum diameter L3 of the first enlarged diameter portion 12 is smaller than the inner diameter X of the hole C3 (see FIG. 7).

For example, the maximum value L3 is 4 mm smaller than the inner diameter X. As an example, the inner diameter X is 50 mm. In addition, the sum of twice the thickness L2 of the diameter expansion member 20 in the radial direction D2 (the thickness of the second diameter expansion portion 21 and the thickness of the cylindrical portion 22) and the diameter L1 of the rod-shaped portion 11 is smaller than the inner diameter X. As an example, the thickness L2 of the diameter expansion member 20 in the radial direction D2 is 3.2 mm.

In this case, the sum of twice the thickness L2 and the diameter L1 of the rod-shaped portion 11 is smaller than the inner diameter X, so that the rod-shaped portion 11 and the tubular portion 22 can be inserted into the hole C3 of the deck C. Also, the sum of twice the thickness L2 of the radial direction D2 of the expanding member 20 and the maximum diameter L3 of the first expanding portion 12 is greater than the inner diameter X. As an example, when the thickness L2 of the radial direction D2 of the expanding member 20 is 3.2 mm, the sum of twice the thickness L2 and the maximum diameter L3 is 52.4 mm. Therefore, the maximum outer diameter L4 of the second expanding portion 21 expanded in the first expanding portion 12 is greater than the inner diameter X of the hole C3 of the deck C, so that the outer surface of the expanded second expanding portion 21 gets caught in the hole C3 (described in detail later).

Figure 6(a) is an enlarged side view of an exemplary hanging member 30. Figure 6(b) is a cross-sectional view of the hanging member 30 and the core rod 10 (rod-shaped portion 11) cut by a plane extending along the longitudinal direction D1. As shown in Figures 1, 2, 6(a) and 6(b), the hanging member 30 hangs the expanding member 20 at a position facing the outer surface of the core rod 10.

The hanging member 30 has a wire 31 connected to the diameter expanding member 20 and a ring portion 32 that hooks the wire 31 onto the rod-shaped portion 11. The hanging member 30 has, for example, a plurality of wires 31 and ring portions 32 located at the upper ends of each of the plurality of wires 31. As an example, the hanging member 30 has two wires 31, and the two wires 31 are arranged to face each other with the core rod 10 (rod-shaped portion 11) in between.

The wire 31 is made of, for example, metal. However, the material of the wire 31 may be FRP, and is not particularly limited. The annular portion 32 is, for example, a ring located at the end of the wire 31 opposite the diameter expansion member 20. As an example, the core rod 10 has a hook portion 15 fixed to the outer surface of the rod-shaped portion 11, and the diameter expansion member 20 may be suspended by hooking the annular portion 32 on the hook portion 15. When suspended by the suspension member 30, the diameter expansion member 20 is suspended such that the second diameter expansion portion 21 is located above the first diameter expansion portion 12.

Next, a specific example of the deck lifting method according to this embodiment will be described with reference to FIG. 7. Below, a method of lifting a deck C using the deck lifting jig 1 will be described. For example, the deck C is an existing deck C, and below, an example of the procedure for lifting and removing the existing deck C will be described. The deck C is placed on a steel girder B, which is, for example, an H-shaped steel having a flange B1 and a web B2. The deck C has an upper surface C1 facing vertically upward and a lower surface C2 facing the opposite side to the upper surface C1. As an example, the steel girder B is a bridge girder.

The types of steel girder B that connects deck C include non-composite girders and composite girders. In a non-composite girder, the steel girder B and deck C are connected by slab stops, and the steel girder B alone resists the load. In contrast, in a composite girder, the steel girder B and deck C are connected by studs or the like, and the steel girder B and deck C together resist the load. In this embodiment, for example, deck C is connected to steel girder B by a non-composite girder. Therefore, deck C can be pulled up with a lighter force than in the case of a composite girder.

7 and 8, first, a hole C3 is formed in the deck C (hole forming process). For example, a through hole penetrating the deck C in the thickness direction is formed as hole C3 by drilling. Meanwhile, the second expansion portion 21 is positioned above the first expansion portion 12, and the expansion member 20 is suspended by the hanging member 30 so that the maximum diameters of the core rod 10 and the expansion member 20 are smaller than the inner diameter X of the hole C3 (expansion member suspending process). For example, the annular portion 32 is hooked onto the hook portion 15 fixed to the outer surface of the core rod 10, and the expansion member 20 is suspended via the hanging member 30.

With the expansion member 20 suspended by the hanging member 30 as described above, as shown in FIG. 9, the first expansion portion 12 of the core rod 10 of the deck hoisting jig 1 is inserted into the hole C3 (insertion process). Then, the expansion member 20 is inserted into the hole C3 (insertion process). For example, the core rod 10 and the expansion member 20 are inserted into the hole C3 of the deck C, causing the core rod 10 and the expansion member 20 to protrude below the underside C2 of the deck C.

At this time, the upper end of the hanging member 30 is located, for example, above the upper surface C1 of the deck C. When the hanging of the diameter expansion member 20 by the hanging member 30 is released in this state (for example, when the annular portion 32 is removed from the hook portion 15), the diameter expansion member 20 descends relative to the core rod 10 (the process of lowering the diameter expansion member).

As shown in FIG. 10, as the expanding member 20 descends relative to the core rod 10, the second expanding portion 21 descends along the outer surface of the first expanding portion 12 and expands relative to the cylindrical portion 22 (expanding process). For example, the cylindrical portion 22 hooks onto the upper end of the first expanding portion 12, and the expanded second expanding portion 21 protrudes from the lower end of the core rod 10 (first expanding portion 12).

As shown in Figures 10 and 11, when the cylindrical portion 22 is hooked onto the upper end of the first enlarged portion 12 and the second enlarged portion 21 is enlarged, the second enlarged portion 21 is hooked onto the deck C (step of hooking the second enlarged portion onto the deck). In the example of Figures 10 and 11, the second enlarged portion 21 is hooked onto the lower surface C2 located on the outer side in the radial direction D2 of the lower end of the hole C3.

As shown in Figures 11 and 12, the deck C is lifted by pulling up the core rod 10 with the second enlarged portion 21 hooked on the deck C (step of lifting the deck). For example, when the second enlarged portion 21 is hooked on the underside C2 of the deck C at the lower end of the hole C3, the second enlarged portion 21 comes into contact with the underside C2 when the core rod 10 (as an example, only the core rod 10) is pulled up, and the lifting force of the core rod 10 is transmitted to the deck C via the first enlarged portion 12 and the second enlarged portion 21. By transmitting the lifting force to the deck C in this way, the deck C can be lifted from the steel girder B. Through the above steps, a series of steps for lifting the deck C is completed.

Next, a modified floor slab lifting method will be described with reference to FIG. 13. As shown in FIG. 13, in the modified floor slab lifting method, the procedure for lowering the lifted floor slab C will be described. Below, an example of lowering the floor slab C to a temporary storage area E (a temporary storage area for trailers will be used as an example) will be described.

First, the deck C, which has been lifted up with the cylindrical portion 22 hooked onto the upper end of the first expansion portion 12 and the second expansion portion 21 expanded, is placed on the top surface of the temporary storage area E (step of placing the deck). Then, as shown in FIG. 14, the expansion member 20 is lifted by the hanging member 30 to move the second expansion portion 21 upward along the first expansion portion 12 (step of lifting the expansion member).

At this time, the second enlarged diameter portion 21 moves upward relative to the first enlarged diameter portion 12, and the second enlarged diameter portion 21 contracts along the outer surface of the first enlarged diameter portion 12 (step of contracting the second enlarged diameter portion). Then, with the second enlarged diameter portion 21 in a contracted state, the enlarged diameter member 20 is suspended by the hanging member 30 (step of suspending the enlarged diameter member). At this time, the enlarged diameter member 20 is suspended by the hanging member 30, for example, by hooking the annular portion 32 onto the hook portion 15.

When the diameter expansion member 20 is suspended by the hanging member 30, the diameter of the core rod 10 and the maximum diameter of the diameter expansion member 20 are smaller than the inner diameter X of the hole C3. Therefore, as shown in FIG. 15, when the core rod 10 is pulled up while the diameter expansion member 20 is suspended by the hanging member 30, it is possible to pull out the deck slab lifting jig 1 from the hole C3 of the deck C. After the deck slab lifting jig 1 is pulled out as described above, the series of steps is completed.

Next, the effects obtained from the deck hoisting jig 1 and deck hoisting method according to this embodiment will be described. In the deck hoisting jig 1, the core rod 10 inserted into the hole C3 formed in the deck C has a first enlarged diameter portion 12, which is smaller than the inner diameter X of the hole C3. The deck hoisting jig 1 has an enlarged diameter member 20 inserted into the core rod 10, which has a cylindrical portion 22 through which the core rod 10 is inserted and a second enlarged diameter portion 21 at the lower end of the cylindrical portion 22 that can be enlarged in diameter.

The expanding member 20 is suspended by a hanging member 30 at a position facing the outer surface of the core rod 10, and is movable up and down along the core rod 10. When the expanding member 20 moves downward relative to the core rod 10, the tubular portion 22 hooks onto the first expanding portion 12 (e.g., the upper end of the first expanding portion 12), and the second expanding portion 21 expands in diameter while moving downward along the first expanding portion 12.

The maximum value of the outer diameter of the second enlarged portion 21 that has moved downward and expanded is larger than the inner diameter X of the hole C3. Therefore, by expanding the second enlarged portion 21 with the first enlarged portion 12 of the core rod 10 inserted into the hole C3, the second enlarged portion 21, which is larger than the inner diameter X of the hole C3, can be hooked onto the hole C3 as shown in Figures 11 and 12. By pulling up the core rod 10 in this state, the deck C can be lifted with the second enlarged portion 21 hooked onto the hole C3, making it unnecessary to place an anchor plate or nut below the hole C3. Therefore, the work involved in lifting the deck C can be easily performed.

As shown in Figures 4(a), 4(b), and 4(c), the expanding member 20 may have hinge portions 23A, 23B, and 23C that support the second expanding portion 21 so that it can swing relative to the cylindrical portion 22 along the radial direction D2 of the cylindrical portion 22. In this case, the second expanding portion 21 is supported so that it can swing relative to the cylindrical portion 22 via the hinge portions 23A, 23B, and 23C. Therefore, the second expanding portion 21 can be smoothly expanded relative to the cylindrical portion 22.

As shown in FIG. 1, the core rod 10 may have a reduced diameter portion 13 located at the lower end of the first enlarged diameter portion 12. In this case, since the reduced diameter portion 13 is located at the lower end of the core rod 10, it is possible to easily insert the core rod 10 into the hole C3 of the deck C located below the core rod 10. In other words, by inserting the core rod 10 from above the hole C3 with the reduced diameter portion 13 facing downward, the possibility of the core rod 10 getting caught in the hole C3 can be reduced, and the core rod 10 can be smoothly inserted into the hole C3.

The hanging member 30 may include a wire 31 supported on the outer surface of the core rod 10. In this case, a wire 31 with a simple structure can be used as the hanging member 30 that hangs the expanding member 20. In addition, since the structure of the hanging member 30 can be simplified, the hanging member 30 can be easily handled.

The hanging member 30 has a ring portion 32 located at the upper end of the wire 31, the core rod 10 has a hook portion 15 fixed to the outer surface of the core rod 10, and the wire 31 may be supported on the outer surface of the core rod 10 by hooking the ring portion 32 onto the hook portion 15. In this case, the wire 31 can be supported on the outer surface of the core rod 10 by hooking the ring portion 32 onto the hook portion 15. This simplifies the configuration of the hanging member 30.

In the floor slab lifting method according to this embodiment, a hole C3 is formed in the floor slab C, and the first expanded diameter portion 12 of the core rod 10 is inserted into the formed hole C3. The cylindrical portion 22 of the expanded diameter member 20 is inserted into the core rod 10, and the expanded diameter member 20 has a second expanded diameter portion 21 that can be expanded relative to the cylindrical portion 22. The expanded diameter member 20 is inserted into the hole C3 of the floor slab C into which the first expanded diameter portion 12 of the core rod 10 is inserted, and the second expanded diameter portion 21 of the expanded diameter member 20 is expanded relative to the hole C3 of the floor slab C to hook the second expanded diameter portion 21 onto the floor slab C. Then, the core rod 10 is pulled up with the second expanded diameter portion 21 hooked onto the floor slab C, thereby lifting the floor slab C. Therefore, since the floor slab C can be lifted by pulling up the core rod 10 with the second expanded diameter portion 21 hooked onto the floor slab C, the task of placing an anchor plate or nut on the lower side of the hole C3 is eliminated. This makes it easy to perform the work involved in lifting the deck C.

The above describes the embodiments of the deck hoisting jig and deck hoisting method according to the present disclosure. However, the present disclosure is not limited to the above-described embodiments, and may be modified or applied to other things without changing the gist of the claims. In other words, the shape, size, number, material and arrangement of each part of the deck hoisting jig, as well as the content and order of the steps of the deck hoisting method, may be modified as appropriate without departing from the gist of the above.

16, the deck hoisting jig and deck hoisting method according to the present disclosure may include a guide member 40 for guiding the insertion of the core rod 10 into the hole C3 of the deck C. The guide member 40 has, for example, a cylindrical portion 41 that narrows in diameter as it approaches downward, and a fitting portion 42 that fits into the hole C3 at the lower end of the cylindrical portion 41. As an example, the fitting portion 42 is fitted into the enlarged portion C4 formed at the upper end of the hole C3. In this way, by providing the guide member 40 having the cylindrical portion 41 that narrows in diameter as it approaches downward in the hole C3, when the core rod 10 is lowered into the guide member 40, the core rod 10 can be guided into the hole C3 along the inner surface of the cylindrical portion 41. Therefore, even if the position of the core rod 10 in a plan view is slightly deviated from the hole C3, the planar position of the core rod 10 relative to the hole C3 can be corrected by the guide member 40. Therefore, the core rod 10 can be smoothly inserted into the hole C3.

In the above embodiment, the core rod 10 is described as having a reduced diameter portion 13 located at the lower end. However, the core rod may not have the reduced diameter portion 13, and the shape of the core rod, etc. can be changed as appropriate. The shapes of the expanding member and the hanging member, etc. can also be changed as appropriate. For example, in the above embodiment, the hanging member 30 having two wires 31 is described. However, the deck slab lifting jig may have a hanging member that does not have wires. In this way, the aspect of the hanging member can also be changed as appropriate.

In the above-described embodiment, an example was described in which a hole C3, which is a through hole, is formed in the deck C. However, in the deck lifting jig and deck lifting method according to the present disclosure, a hole that is not a through hole may be formed in the deck. For example, as shown in FIG. 17(a), a hole C13 may be formed having an inner surface C131 extending downward from the upper surface C1 of the deck C, and an expanded diameter hole portion C132 that expands in diameter as it extends downward from the inner surface C131. In this case, the deck C can be lifted in the same manner as in the above-described embodiment by hooking the second expanded diameter portion 21 of the expanding diameter member 20 onto the expanded diameter hole portion C132 of the hole C13.

Also, as shown in FIG. 17(b), a hole C23 may be formed having an inner surface C231 extending downward from the upper surface C1, and an expanded diameter hole portion C232 expanded at the lower end of the inner surface C231. The expanded diameter hole portion C232 has a cylindrical shape expanding radially outward from the lower end of the inner surface C231. For this hole C23 as well, the deck C can be lifted in the same manner as in the above-mentioned embodiment by hooking the second expanded diameter portion 21 of the expanding member 20 to the upper end of the expanded diameter hole portion C232 of the hole C23. In this way, the form of the hole formed in the deck can also be changed as appropriate.

In the above embodiment, the hanging member 30 including the wire 31 and the annular portion 32 has been described. However, the form of the hanging member that hangs the diameter expansion member 20 is not limited to the hanging member 30 and can be changed as appropriate. For example, the hanging member may include a wire connected to the diameter expansion member 20, a winch that pulls up the wire, and a control unit that drives and controls the winch. In this case, the vertical movement of the diameter expansion member 20 relative to the core rod 10 can be performed automatically without manual intervention. Therefore, the work of lifting the deck C can be performed even more easily.

1... Deck slab lifting jig, 10... Core rod, 11... Rod-shaped portion, 12... First expansion portion, 13... Reduced diameter portion, 15... Hook portion, 20... Expansion member, 21... Second expansion portion, 22... Cylindrical portion, 23A, 23B, 23C... Hinge portion, 30... Hanging member, 31... Wire, 32... Annular portion, 40... Guide member, 41... Cylindrical portion, 42... Fitting portion , B...steel girder, B1...flange, B2...web, C...deck slab, C1...upper surface, C2...lower surface, C3, C13, C23...hole, C131, C231...inner surface, C132, C232...expanded hole section, C4...expanded section, D1...longitudinal direction, D2...radial direction, E...temporary storage area, L1...diameter, L2...thickness, L3, L4...maximum value, X...inner diameter.

Claims (4)

A deck slab lifting jig for lifting a deck slab,
A core rod is inserted into a hole formed in the deck and has a first enlarged diameter portion at a lower end thereof, the first enlarged diameter portion having an outer diameter smaller than an inner diameter of the hole;
a cylindrical portion through which the core rod is inserted, and a second diameter expanding portion at a lower end of the cylindrical portion, the second diameter expanding portion being capable of expanding in diameter;
A hanging member that hangs the diameter expansion member at a position facing the outer surface of the core rod;
Equipped with
the expanding member is movable along the core rod, and when the expanding member moves downward relative to the core rod, the cylindrical portion is caught on the first expanding portion and the second expanding portion is expanded in diameter;
the maximum value of the outer diameter of the expanded second diameter portion is greater than the inner diameter of the hole,
The suspension member includes a wire supported on an outer surface of the core rod,
The suspension member has a loop portion located at an upper end of the wire,
The core rod has a hook portion fixed to an outer surface of the core rod,
The wire is supported on the outer surface by hooking the loop portion onto the hook portion.
Deck slab lifting jig. The diameter expansion member has a hinge portion that supports the second diameter expansion portion so as to be swingable relative to the cylindrical portion along a radial direction of the cylindrical portion.
A deck slab lifting jig as claimed in claim 1. The core rod has a reduced diameter portion located at a lower end of the first expanded diameter portion.
A deck slab lifting jig as claimed in claim 1 or 2. A method for lifting a deck slab, comprising the steps of:
forming a hole in the deck;
A step of inserting a first enlarged diameter portion of a core rod of a deck lifting jig into the hole;
a step of inserting a diameter expanding member into the hole, the diameter expanding member having a cylindrical portion through which the core rod is inserted and a second diameter expanding portion that is capable of expanding in diameter relative to the cylindrical portion;
A step of expanding the second expansion portion to hook the second expansion portion onto the deck;
A step of lifting up the deck slab by pulling up the core rod in a state in which the second expanded diameter portion is caught;
Equipped with
The deck slab lifting jig has a hanging member that hangs the expansion member at a position facing the outer surface of the core rod,
The suspension member includes a wire supported on an outer surface of the core rod,
The suspension member has a loop portion located at an upper end of the wire,
The core rod has a hook portion fixed to an outer surface of the core rod,
The wire is supported on the outer surface by hooking the loop portion onto the hook portion.
How to lift the deck.

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